cube_part: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/cube_part - from package: cube

You may install the required package with command yum install {package}

Error in other languages:
cube_part: bevel nie gevind nie
cube_part: comandă negăsită
cube_part: comando não encontrado
cube_part: commande introuvable
cube_part: command not found
cube_part: käsku ei ole
cube_part: không tìm thấy lệnh
cube_part: komanda nerasta
cube_part: Kommando nicht gefunden.
cube_part: kommandot finns inte
cube_part: komut yok
cube_part: nie znaleziono polecenia
cube_part: níor aimsíodh an t-ordú
cube_part: no se encontró la orden
cube_part: no s'ha trobat l'ordre
cube_part: opdracht niet gevonden
cube_part: parancs nem található
cube_part: perintah tidak ditemukan
cube_part: príkaz nenájdený
cube_part: příkaz nenalezen
cube_part: команда не найдена
cube_part: командата не е открита
cube_part: 命令找不到
cube_part: コマンドが見つかりません